X= 16.
All you have to do is isolate x to one side.
To do this, subtract 10 from 26.
26-10=16
If you add 12% + 12%= 24% you can just double 30 making the answer 60
If you would like to know 52.5% of what number is 25.83, you can calculate this using the following steps:
52.5% of what number is 25.83
52.5% * x = 25.83
52.5/100 * x = 25.83 /*100/52.5
x = 25.83 * 100 / 52.5
x = 49.2
Result: 52.5% of 49.2 is 25.83.